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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. See the documentation for help with subscribing to or submitting Circulars.

Search for Circulars by submitter, subject, or body text (e.g. 'Fermi GRB').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
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To narrow the search results, use advanced search syntax. This allows for specifying which circular field to search (submitter, subject, and/or body). For additional information, refer to the advanced search documentation.

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subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

600 results found.

  1. The giant outburst from SGR 1806-20
  2. Giant flare from SGR 1806-20 detected by INTEGRAL
  3. Very high activity of SGR 1806-20
  4. Summary of the recent bursts from SGR 1806-20
  5. IBAS GRB Alert # 2034
  6. Bright bursts from SGR1806-20
  7. Konus-Wind observation of a series SGR 1806-20 bursts on 041005
  8. Bursts from SGR 1806-20: Preliminary INTEGRAL results
  9. Very strong outburst from SGR 1806-20 detected with INTEGRAL
  10. SGR 1806-20 still active
  11. An intense burst from SGR1806-20
  12. Very bright burst detected from SGR 1806-20
  13. Increase of SGR 1806-20 activity
  14. Bursting activity from SGR 1806-20 detected with IBAS
  15. Ongoing activity of SGR 1806-20
  16. GRB040706:observation at University of Miyazaki
  17. SGR 1806-20: no IR variability of the proposed counterparts
  18. SGR 1806-20, potential NIR counterpart
  19. Activivty of SGR 1806-20
  20. IBAS GRB Alerts n.1785 to 1791
  21. Summary of recent bursts from SGR 1806-20 detected by INTEGRAL
  22. IBAS GRB Alert 1694
  23. IBAS GRB alerts 1679, 1680, 1681
  24. IBAS results on a burst from SGR1806-20
  25. IBAS alert 1180 refers to a burst from SGR 1806-20
  26. Ongoing Bursting Activity from SGR 1806-20 detected with IBAS
  27. SGR1806-20 bursts on 031008. Helicon detection and small error box.
  28. SGR 1806-20 bursts with INTEGRAL and IBAS announcement on Soft Gamma-Ray Repeaters
  29. A burst from SGR 1806-20 detected with IBAS
  30. IPN triangulation of GRB030926 (short/hard; large error box)
  31. IBAS detection of bursts from SGR 1806-20
  32. Radio Observations of SGR1806-20
  33. INTEGRAL ToO OBSERVATIONS OF SGR1806-20: CALL FOR CORRELATED OBSERVATIONS
  34. Summary of recent IPN and HETE detections of SGR bursts
  35. Clarification of GCN 2354 on SGR1806-20
  36. IPN detection of continued activity from SGR1806-20
  37. 030813 SGR event (Konus-Wind observation)
  38. SGR 1808-20 (=H2802): A Possible new SGR
  39. SGR 1806-20, submm observations
  40. RXTE PCA Observations of SGR1806-20 Region
  41. HETE detection of burst from SGR1806-20
  42. GRB030329 observed as a sudden ionospheric disturbance (SID)
  43. IPN triangulation of GRB021219
  44. IPN detection of continued activity from SGR1806-20
  45. IPN detection of renewed activity from SGR1806-20
  46. IPN detection of continued SGR1900+14 activity
  47. IPN confirmation of the reactivation of SGR1900+14
  48. IPN detection of possible reactivation of SGR1900+14
  49. IPN triangulation of bursts from SGR1900+14, November 1-2, 2002
  50. SGR1900+14 activity, November 2-4, 2002
  51. Detection of activity from SGR 1900+14 with the RXTE/PCA
  52. IPN detection of a burst from SGR1900+14
  53. Gemini IR Detection of AXP 1E 2259+586 Post-Burst
  54. SGR-like X-ray Bursts from AXP 1E 2259+586: follow-up
  55. AXP 1E2259+586: quasi-simultaneous optical observation
  56. AXP 1E2259+586 optical observations
  57. SGR-like Bursts from the AXP 1E 2259+586
  58. IPN detection of possible bursts from SGR1806-20
  59. XRF 020427: Sudden Ionospheric Disturbance (SID)
  60. Mars Odyssey joins the IPN
  61. IPN detection and localization of Cygnus X-1 flares
  62. RXTE Observations of SGR 1900+14
  63. SGR1900+14 activity
  64. IPN/HETE Detection of Bursts from SGR1900+14
  65. IPN detection of further activity from SGR1806-20
  66. Optical observation of SGR 1806-20 at the 6-m SAO telescope
  67. Probable SGR or Short Duration GRB Detected by HETE
  68. Dramatic Increase in the Rate of X-ray Bursts Reported by HETE
  69. Possible burst from SGR1806-20
  70. IPN detection of SGR1900+14
  71. X-ray precursors to the large flare from SGR 1900+14
  72. SGR 1900+14: No evidence of extended X-ray emission
  73. SGR 1900+14 : RXTE observations
  74. BeppoSAX/NFI Follow-up Observation of SGR 1900+14
  75. SGR1900+14
  76. SGR 1900+14: Correction to GCN 1049
  77. Millimeter observation of SGR 1900+14
  78. SGR 1900+14: Detection of extended X-ray emission
  79. Chandra Observations of SGR 1900+14
  80. SGR 1900+14, Chandra observations
  81. Chandra Observations of SGR 1900+14
  82. SGR1900+14, I-band observations
  83. SGR 1806-20 burst activity
  84. BATSE GRB trigger criteria
  85. X-ray/GRB 1SAX J0835.9+5118, BATSE Observation
  86. GRB990308 not a new SGR
  87. GRB990308, Possible new SGR~0209+70
  88. SGR1900+14, BeppoSAX-GRBM observations
  89. SGR1627-41
  90. SGR1627-41, RXTE/ASM observations
  91. Reduced error box of SGR 1627-41
  92. SGR 1627-41
  93. Discovery of a new SGR source, SGR1627-41
  94. SGR 1900+14
  95. SGR1900+14
  96. SGR1900+14
  97. BATSE on-board GRB trigger change
  98. IRAS 18119-1342 and the possible new SGR
  99. Possible new SGR from US Naval Observatory
  100. RXTE Observations of SGR 1814-13

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